Reza Sahebi Kuzeh Kanan; Hanieh Niroomand-Oscuii; Kohyar Yazdanpanah-Ardakani
Volume 13, Issue 4 , December 2019, , Pages 315-326
Abstract
Nowadays, patients crowd suffering from heart disease are increasing along with the development of technology and mechanized life. On the other hand, donor hearts ready for transplantation is limited in the world. Therefore, exploiting blood pumps is a suitable alternative for helping the patient during ...
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Nowadays, patients crowd suffering from heart disease are increasing along with the development of technology and mechanized life. On the other hand, donor hearts ready for transplantation is limited in the world. Therefore, exploiting blood pumps is a suitable alternative for helping the patient during the waiting time and even until the end of life. The blood pumps should be able to satisfy the biological needs, including proper output pressure and flow rate, in an acceptable margin of safety in terms of blood injuries. Reduction of pump size, blood exposure time and blood damages such as hemolysis are mentioned as the important challenges in the design of blood pumps. 30% of the patients who are using a left ventricle blood pump, required right ventricle blood pump due to right ventricle failure. Fulfilling the physiological requirement of right ventricle a RVAD must generate pressure in the range of 15-25 mmHg and flow rate equal to 5 L/min. generation of pressure over 25 mmHg will lead to pulmonary hypertension and its consequent problems. In this research, a centrifugal blood pump is designed for the right ventricle with an emphasis on impeller geometry. This pump is simulated for rotational speeds of 1500, 2000 rpm and flow rates of 4-6 L/min by using the computational fluid dynamics. The designed pump produces a flow rate of 5 L/min at 1500 rpm and a pressure of 23 mmHg. The amount of the hemolysis index calculated by the Lagrangian method is 0.00413.
Artificial Organs
Erfan Nammakie; Hanieh Niroomand Oscuii; Farzan Ghalichi; Mojtaba Koochaki
Volume 9, Issue 2 , July 2015, , Pages 133-142
Abstract
Myocardial diseases are on the rise all over the world and due to lack of sufficient donors, heart transplants are not the perfect solutions to treat all patients with heart failure. Therefore, in recent years, blood pumps have received a worldwide admissibility and have become the unrivalled tools for ...
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Myocardial diseases are on the rise all over the world and due to lack of sufficient donors, heart transplants are not the perfect solutions to treat all patients with heart failure. Therefore, in recent years, blood pumps have received a worldwide admissibility and have become the unrivalled tools for replacing a failed heart. In addition to biological needs such as sufficient head and flow rate, an assist blood pump should be in an acceptable margin of safety in terms of blood injuries such as hemolysis and thrombosis. Reducing blood damages, minimizing dimensions, reducing exposure time and simulating blood flow of natural heart are amongst the greatest challenges in designing assist blood pumps. One of the most important factors in determining the amount of blood injuries inside the pump is the blades’ shape of different parts of the pump. Studies have been conducted about heart pumps show that it is feasible to increase the efficiency of the pump and reduce the stagnation points that lead tothrombus formation by changing the type of blades of the impeller. The purpose of this study is to compare the performance of several airfoils for the blades of the impeller of an assist heart pump in order to optimize the performance and efficiency of the pump and reduce blood damages.
